General Motors has issued a technical service bulletin (TSB) to address a water pump failure problem on certain examples of the Chevy Silverado 1500 and GMC Sierra 1500 pickup trucks and the Cadillac CT4 and Cadillac CT5 sedans.
According to the TSB, the printed circuit board inside of the water pump on affected vehicles “may have been manufactured incorrectly, potentially causing a water pump failure.”
If this happens, the vehicle will display multiple warnings to the customer as coolant temperatures rise, the TSB indicates. The oil pressure gauge will also indicate high oil pressure and a notification will also appear on the dash warning the driver of reduced torque and power. If the customer continues to drive after these two warnings are sent, the vehicle will emit a warning chime, the air conditioning will be disabled and an additional message instructing the driver to turn off the vehicle will illuminate on the dash. If the customer still continues to drive the vehicle, the engine will eventually shut down and the vehicle will be undrivable.
To address this issue, dealers will inspect and replace the entire water pump assembly on affected vehicles. These repairs will be performed at no cost to the vehicle owner and should take around four hours to complete.
Vehicles powered by either the turbocharged 2.7L L3B four-cylinder or the turbocharged 2.0L LSY four-cylinder are the only ones affected by this problem. The following makes and models are included in the TSB:
This TSB went live on December 1st, 2020 and will remain in effect until December 31st, 2022, the document that was sent to dealerships indicates. Customers with vehicles that may be affected by the water pump failure issue can reach out to their dealership or to GM customer service for more information.